Practicing scales in chromatic octaves train your fingers for textures such as Bach’s lute suites and more. Octaves are also very useful in jazz or ensemble playing when you need a melodic line to sound strong and full. Do your best to not read this exercise but instead just think of the note names and the interval shapes. As with the previous exercise, play on your fingertips with curved fingers that clear the string below. Play as legato as possible.These have a potential to stretch the muscles so be careful and take breaks to let them recover. Other logical left-hand fingerings are acceptable, these ones are just a suggestion. You’ll get a workout regardless.